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2010MNRAS.407.2475F - Mon. Not. R. Astron. Soc., 407, 2475-2500 (2010/October-1)

Ionized gas in E/S0 galaxies with dust lanes.

FINKELMAN I., BROSCH N., FUNES J.G., KNIAZEV A.Y. and VAISANEN P.

Abstract (from CDS):

We report the results of multicolour observations of 30 E/S0 galaxies with dust lanes. For each galaxy we obtained broad-band images and narrow-band images using interference filters isolating the Hα+[Nii] emission lines to derive the amount and morphology of dust and ionized gas. To improve the wavelength coverage we retrieved data from the Sloan Digital Sky Survey and Two Micron All Sky Survey and combined these with our data. Ionized gas is detected in 25 galaxies and shows in most cases a smooth morphology, although knots and filamentary structure are also observed in some objects. The extended gas distribution closely follows the dust structure, with a clear correlation between the mass of both components. An extinction law by the extragalactic dust in the dark lanes is derived and is used to estimate the dust content of the galaxies. The derived extinction law is used to correct the measured colours for intrinsic dust extinction and the data are fitted with a stellar population synthesis model. We find that the Hα emission and colours of most objects are consistent with the presence of an old' stellar population (∼10Gyr) and a small fraction of a young' population (∼ 10-100Myr). To check this we closely examine NGC5363, for which archival Spitzer/Infrared Array Camera and Galaxy Evolution Explorer data are available, as a representative dust-lane E/S0 galaxy of the sample.

Journal keyword(s): dust, extinction - galaxies: elliptical and lenticular, cD - galaxies: ISM

VizieR on-line data: <Available at CDS (J/MNRAS/407/2475): table1.dat table3.dat table4.dat table6.dat table7.dat>

CDS comments: In Table 4 : ESO 119-97 is a misprint for ESO 197-10